What was found
(CAN) ON APPROACH, LEFT GEAR DID NOT EXTEND WHEN GEAR SELECTED. NO IN-TRANSIT LIGHT NOTED, INDICATING GEAR DID NOT RELEASE FROM UPLOCK. EMERG EXTENSION CARRIED OUT BUT LEFT GEAR STILL FAILED TO EXTEND. GEAR RETRACTED AND NORMAL EXTENSION CARRIED OUT. LEFT STILL FAILED. ONCE AGAIN EMERG TRIED AND AFTER SEVERAL PUMPS WITH EMERG PUMP, IT RELEASED. A/C LANDED OK. SUBSEQUENT CHECKS CONFIRMED THAT SYSTEM WOULD NOT RELEASE DURING NORMAL GEAR EXTENSION. INSP FOUND THAT UPLOCK LATCH RELEASE MECHANISM HAD EXCESSIVE PLAY FROM ELONGATED HOLES IN TUBE, P/N 27-51000-59, WHERE ARMS AND STOPS ARE SECURED TO IT. THIS EXCESSIVE PLAY PREVENTED UPLOCK RELEASE MECHANISM FROM HAVING SUFFICIENT TRAVEL TO RELEASE UPLOCK LATCH